Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2022/10/14 13:00-13:15

Participants: Takahashi, Akutsu, Tomaru, Mitsuhashi, Ushiba, Uchiyama, Yokozawa, Aso, Miyoki, Hirata, Kimura, Ikeda

Post O3 Upgrade portal

Schedule

• Type-A: Offload of the GAS filters in IX. Test of the heater control in IY.
• Type-B: Diagonalization of the IP in BS/SR2. Sensor correction in BS.
• Type-Bp:
• Type-C:

Status

• Replacement of cables: EXT remains.
• Oplev: Stabilization of the light source.
• ACC: Evaluation.
• Commissioning: FPMI lock with low noise suspension controls.

• Acceptance check: DropboxPaper

• Vacuum system: Reak test in BS was finished. Pump down of the TMSY was started on 10/12. Leak test in IMM, IFI, PRs, and TMSY in the next week.
• Heater control: Test in IY.
• TMS: Evacuation of TMSY.

Discussion

VIS Meeting

Date: 2022/10/14 14:00-14:20

Participants: Takahashi, Uchiyama, Fabian, Lucia, Washimi, Tanaka, Ushiba, Aso

Summary Report

Type-A

• Offloaded the GAS filters in IX.
• Testing the heater control in IY.

Type-B

• BS sensor correction implemented. It seems to be working fine. Noise budget and a deeper analysis of its performance are ongoing.
• In BS too, tentative blending filters could be implemented and tested next week.
• I tracked down the location of the data used for the calibration of BS geophones. I'll do the calibration again, just for our information.
• I compared the geophone outour in SRM, SR2 and SR3. They are all similar but there are differences. I'll check again next week.
• In SR2, I did IP LVDT and actuator diagonalization. The difficulty is that the resonance frequencies in L and T are both very close to 66 mHz. Some coupling reduced, but from Y to T, actuation coupling increased to 20% of the resonance in T. I want to revert to previous values of the diagonalization matrices.

Type-Bp

• PRM: mechanical suspension models of TM have been uploaded on the filter banks.
• Control filters for strong damping is ready to be tested next week

Type-C

Electronics

• Prototyping the geophone pre-amp.

Control

Schedule

• Type-A: Investigation of ACCs.
• Type-B: Optimization of IP controls.
• Type-Bp: Test of filters.
• Type-C:

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 10/17

• Takahashi: 10/17-19
• Hirata:
• Sato: 10/18-21

The week from 10/24

• Takahashi:
• Hirata:
• Sato:

Next meeting

• 2022/10/21(FRI) 13:30